An email that was sent to then-candidate Donald Trump and his son Donald Trump Jr. in Sept. 2016 pointed them to hacked WikiLeaks documents that had already been made public, according to a copy of the email provided to NBC News by Trump Jr.'s lawyer.

The email, first reported by CNN, offered a decryption key and a website address to access the documents, the officials said.

But the email is dated Sept 14, not Sept 4, as CNN had reported. On Sept 13, the day before the email, WikiLeaks had tweeted links to what the group said was 678.4 megabytes of DNC documents.

Trump Jr.'s attorney, Alan S. Futerfas, said in a statement to NBC News that the email "arrived after published media reports disclosed 12 hours earlier that hacked documents had been posted. The suggestion that this information was not public is false."

Trump Jr. Releases Emails on Meeting With Russian Attorney

Donald Trump, Jr. has released emails detailing his meeting with a Russian attorney who promised compromising information on then-Democratic candidate for president, Hillary Clinton. He said he released the exchanges "in order to be totally transparent."